单词拼写。根据下列句子及所给汉语注释，在句子的空缺处各单词的正确形式。

（每空只写一词）

1. He was terribly (不安的) ______ over her illness

2. The children's mother was very (担心的) ______ for their safety when they didn't come back from 

    school at the usual time.

3. She looks young, but she's (实际上) ______ 50.

4. Usage (决定) _______ what is good English.

5. Judging by her (口音) _______, she must be a Southerner.

6. Professor King often contributes (投稿) to the medical (杂志, 日记) ______.

7. What's your (态度) _______ to this idea?

8. The salesman (劝说) _______ us into buying his product yesterday.

9. The Beijing-Hangzhou (运河) _______ is the oldest one in the world.

10. A (爆发)______ of hand-clapping (掌声) followed the ending of the song.